API High Quality Inverted Pressure Balanced Lubricated Plug Valve

Product Attribute: port size:Standard
type:Other Valves
structure:Plug
application:General
place of origin: China
power:Manual
customized support:OEM, ODM, OBM
temperature of media:Normal Temperature
brand name:TIANYU
media:Water
Standard or Nonstandard:Standard
Product Name:Lubricated plug valve
Type:PLUG VALVES

INFO@TYFLUIDGROUP.COM

Specification

TIANYU Back Pressure Balanced Lubricated Plug Valve: Industrial Fluid Control Solution

I. Product Overview

TIANYU back pressure balanced lubricated plug valves are high-performance shut-off valves designed to API 599 and API 6D standards, featuring a back pressure balanced structure and forced lubrication system for reliable sealing and low-torque operation under high-pressure conditions. Constructed with stainless steel and other corrosion-resistant materials, these valves suit industrial pipelines handling water, oil, gas, and more, particularly excelling in high-pressure applications within oil & gas, chemical, and power industries.

II. Key Technical Parameters

Technical Specifications
- Design Standards: API 599, API 6D (American Petroleum Institute)
- Connection Standards: Flanged ends per ASME B16.5 (Class 150~Class 2500), face-to-face dimensions per ASME B16.10
- Pressure Classes: PN16~PN100 (Class 150~Class 600)
- Temperature Range: -20℃~180℃ (standard), customizable to -40℃~300℃
- Bore Sizes: DN15~DN200 (1/2″~8″)
Material Configuration
- Body/Bonnet: WCB cast steel, 304/316 stainless steel, CF8M (optional)
- Plug: Forged stainless steel (surface hardened, HV≥250)
- Sealing Surfaces: Metal hard seal + PTFE auxiliary seal, grease passage in brass
- Lubrication System: Dedicated high-pressure grease injector, compatible with NLGI 2# lithium-based grease
Performance Parameters
- Seal Testing: Per API 598, shell test at 1.5x rated pressure, seal test at 1.1x rated pressure
- Leakage Rate: Bubble-tight seal (API 598 Class VI), bi-directional zero leakage
- Operating Torque: ≤150N·m for DN100 (manual operation), compatible with electric/pneumatic actuators

Product Overview

III. Structural Design & Technical Features

Back Pressure Balanced Structure
- A balancing piston at the plug base counteracts axial force using medium pressure, reducing operating torque by 30%~50%—ideal for high-pressure scenarios (e.g., Class 600 systems).
- The balancing chamber connects to the medium channel, automatically compensating for pressure fluctuations to prevent jamming.
Forced Lubrication Sealing System
- A circular lubrication groove between the plug and body injects specialized grease via a grease valve, forming a dynamic sealing film with specific pressure ≥10MPa while minimizing friction wear.
- Lubricating grease isolates the medium from metal surfaces, preventing corrosion and scaling to extend valve life.
Bi-Directional Flow Design
- No flow direction restriction simplifies installation in bidirectional pipelines (e.g., heat exchanger inlets/outlets, tank connecting lines).
- Symmetric sealing surfaces achieve API 598 Class VI sealing in both directions.

IV. Manufacturing Processes & Quality Control

Core Technologies
- Body Casting: Investment casting (lost-wax process) ensures dimensional accuracy CT6 and surface roughness Ra≤12.5μm, with no shrinkage or slag in critical areas.
- Plug Machining: CNC lathe precision turning with grinding ensures sealing surface flatness ≤0.01mm, 配合间隙 controlled at 0.05~0.1mm with the body.
- Surface Treatment: Stainless steel components passivated, cast steel parts coated with epoxy resin (thickness ≥100μm), passing 500-hour salt spray test.
Quality Certifications & Testing
- Certifications: ISO 9001 (quality management), ISO 14001 (environmental management), CE (Machinery Directive 2006/42/EC)
- Testing Procedures:
  - 1.5x rated pressure shell strength test (5-min hold, no leakage) for each valve
  - 1.1x rated pressure seal test (bi-directional)
  - Torque test: ≤15% fluctuation at ambient temperature